RIOT-OS/RIOT — pull request #1997 by Troels51 (2014-11-11 16:33:45+00:00)
Title: samr21: implemention of transceiver via spi

Implementaion of the at86rf231 driver for the samr21 chip this include
- A gpio fix
- An SPI implementation with SPI_0 being used for the internal transceiver. Does not support more than 1Mhz transfer